Photovoltaic power generation grid-connected protection device

Abstract

The utility model discloses a photovoltaic power generation grid-connected protection device, and relates to the technical field of photovoltaic power generation. The high-low-voltage photovoltaic grid-connected cabinet comprises a high-low-voltage photovoltaic grid-connected cabinet body, a main circuit breaker and a plurality of branch switches are fixedly arranged in the high-low-voltage photovoltaic grid-connected cabinet body, the main circuit breaker is electrically connected with the branch switches, and the branch switches are all connected with external wires. And the main circuit breaker and the branch switch are used for controlling the on-off of the circuit. According to the photovoltaic power generation grid-connected protection device, through the synergistic effect of the moving assembly and the elastic mechanism, the wire rod forms a dynamic redundant structure, thermal expansion and cold contraction deformation can be automatically compensated, the redundant length is released during external pulling, and damage to a connection point can be avoided; the rubber pressing plate and the abutting plate form a graded fixing system, flexible pressing and rigid clamping are carried out on the bent part and the root part respectively, and it can be ensured that the wire connecting point is not prone to being affected when the redundant section moves.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic power generation technology, and in particular relates to a photovoltaic power generation grid connection protection device. Background Technology

[0002] With the increasing global demand for clean energy, photovoltaic (PV) power generation, as an important renewable energy source, has been widely promoted and applied. PV power generation systems convert solar energy into electricity, reducing dependence on traditional fossil fuels and effectively lowering greenhouse gas emissions, thus playing a significant role in environmental protection and sustainable development. In PV power generation systems, the grid-connected cabinet, as the core power distribution equipment, undertakes the crucial function of power transmission and protection between the PV array and the power grid. However, existing PV grid-connected cabinets still have the following problems in use:

[0003] During the grid connection of photovoltaic power generation, changes in ambient temperature and operator errors may cause the connecting cables to be subjected to external forces such as thermal expansion and contraction and tension, which may lead to changes in the length of the cables and even damage to the connection between the cables and the grid-connected cabinet, affecting the normal operation of the photovoltaic power generation system and the safety and stability of the power grid.

[0004] When multiple network cables are connected inside the cabinet, they are prone to tangling and crossing, which reduces the heat dissipation efficiency of the cables (local temperature rise can reach more than 15°C), and requires a lot of time to troubleshoot the lines during maintenance, resulting in high operation and maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a photovoltaic power generation grid-connected protection device. This device, through the coordinated action of a moving component and an elastic mechanism, enables the wire to form a dynamic redundant structure, automatically compensating for thermal expansion and contraction deformation, and releasing the redundant length when externally pulled, thus preventing damage to the connection points. A rubber pressing plate and an abutment plate constitute a graded fixing system, applying flexible pressing and rigid clamping to the bent portion and root, respectively, ensuring that the wire connection points are not easily affected when the redundant section shifts. The device has a compact layout; the through-holes and three-dimensional wire management frame achieve neat arrangement of the wires, combining efficient heat dissipation and convenient maintenance, significantly improving the reliability and practicality of the photovoltaic grid-connected system and solving existing technical problems.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A photovoltaic power generation grid-connected protection device, comprising:

[0008] The main body of the high and low voltage photovoltaic grid-connected cabinet includes a main circuit breaker and multiple branch switches fixedly installed inside. The main circuit breaker and multiple branch switches are electrically connected, and each of the branch switches is connected to external wiring. The main circuit breaker and branch switches are used to control the on and off of the circuit.

[0009] It also includes a cable management rack, which is located below multiple branch switches. Both ends of the cable management rack are fixedly connected to the inner wall of the high and low voltage photovoltaic grid-connected cabinet body. The cable management rack is used to arrange, organize and fix the cables.

[0010] It also includes multiple through holes, all of which are located on one side of the back of the high and low voltage photovoltaic grid-connected cabinet body, and are used to complete the entry and exit of wires;

[0011] It also includes a movable component, which includes a movable plate, a fixed rod, and multiple fixed brackets for applying compression bending to the wires to be connected, giving them movable redundant portions; the movable component also includes a rubber pressing plate and an abutment plate, which cooperate with the cable management frame to fix one end of the movable portion of the wires when the wires are pulled.

[0012] Optionally, the cable management rack consists of three fixed plates, each of which has multiple cable management grooves on one side. The fixed plates are fixedly connected to each other and are arranged perpendicularly between adjacent fixed plates.

[0013] Optionally, the fixing rod is fixedly installed between the inner walls of both sides of the main body of the high and low voltage photovoltaic grid-connected cabinet, and the fixing rod is located above multiple fixing frames; each of the multiple fixing frames consists of a T-shaped rod and two protruding columns, the bottom end of the T-shaped rod is fixedly connected to the top of the movable plate, and gaps are left between the T-shaped rod and the inner wall of the adjacent high and low voltage photovoltaic grid-connected cabinet body and between two adjacent T-shaped rods to allow the passage of wires; the multiple fixing frames and fixing rods cooperate to complete the winding of the wires.

[0014] Optionally, the moving component further includes an elastic mechanism, which includes two guide rods fixedly installed inside the main body of the high and low voltage photovoltaic grid-connected cabinet. Both guide rods are located near the bottom inner wall of the main body of the high and low voltage photovoltaic grid-connected cabinet. The moving plate is slidably sleeved on the outer wall of the two guide rods. The outer wall of each of the two guide rods is sleeved with a first spring. One end of each of the two first springs is fixedly connected to one side of the adjacent moving plate, and the other end of each of the two first springs is fixedly connected to one side inner wall of the main body of the high and low voltage photovoltaic grid-connected cabinet. The two first springs are used to push the moving plate to move along the axial direction of the guide rods, thereby continuously moving away from the fixed rods, so as to ensure that the multiple fixed frames and fixed rods can make the wires form a movable redundant part.

[0015] Optionally, the moving component further includes a graded fixing mechanism, which includes multiple first connecting frames fixedly installed on the side of the moving plate away from the first spring. The rubber pressing plate is fixedly installed on one side of multiple guide rods. Multiple grooves are provided on one side of the rubber pressing plate. The rubber pressing plate cooperates with the cable management frame. The grooves and the cable management grooves of the cable management frame are correspondingly arranged to form a flexible pressing structure for the bending part of the cable, which is used to press and fix the bending part of the cable.

[0016] Optionally, the movable component further includes multiple second connecting frames fixedly installed on one side of multiple first connecting frames. A connecting rod slides through one side of each of the multiple second connecting frames. One end of each of the multiple connecting rods is fixedly connected to one side of an abutment plate. Multiple abutment grooves are formed on the other side of the abutment plate. The abutment plate slides into the top of the cable management frame. The multiple abutment grooves correspond to and cooperate with multiple cable management grooves, forming rigid clamping points to clamp and fix the corresponding cables. A second spring is sleeved on the outer wall of each of the multiple connecting rods. One end of each of the multiple second springs is fixedly connected to one end of the corresponding connecting rod, and the other end of each of the multiple second springs is fixedly connected to one side of an adjacent second connecting frame. The multiple second springs provide the abutment plate with force to abut and compress the cables.

[0017] Optionally, both protrusions are fixedly connected to the outer wall of the corresponding T-shaped rod. The two protrusions are located near both ends of the T-shaped rod, and both protrusions are located on the side away from the through hole, so as to ensure that the wire is not easy to slip off when it is wound around the outer wall of the T-shaped rod.

[0018] The embodiments of this utility model have the following beneficial effects:

[0019] In this invention, by setting a movable component, including a movable plate, a fixed rod and multiple fixed frames, the cable wire forms a movable redundant part after passing through the fixed rod and fixed frames; this redundant part can absorb the length change of the cable wire caused by thermal expansion and contraction, effectively avoiding damage to the connection caused by the length change of the wire.

[0020] In this invention, the elastic action of the first spring is used to push the moving plate away from the fixed rod, ensuring that a certain distance is always maintained between the multiple fixed brackets and the fixed rod, so that the redundant part of the wire remains in a preset S-shaped bending state; when the external cable is pulled, the moving plate can overcome the pre-tightening force of the first spring and move in the opposite direction, so that the redundant part extends out, further protecting the connection of the wire inside the cabinet.

[0021] In this invention, by setting a rubber pressing plate and an abutment plate, which cooperate with the cable management frame, one end of the moving part of the cable can be double-fixed when the cable is pulled; the rubber pressing plate presses and fixes the bent part of the cable, while the abutment plate clamps and fixes the cable through the cooperation of the abutment groove and the cable management groove; this double fixing mechanism ensures that the connection between the cable and the switch is not affected when the redundant part of the cable moves, thereby ensuring the connection safety of the line;

[0022] In this utility model, the device has a compact overall structure and a reasonable layout between its components, which facilitates installation and maintenance in a limited space. At the same time, by setting up cable holes and cable management racks, the neat arrangement and fixation of the cables are achieved, ensuring good heat dissipation of the cables and improving the overall aesthetics and practicality of the device.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view structural diagram of an embodiment of the present utility model.

[0026] Figure 2 This is a rear view structural diagram of an embodiment of the present invention.

[0027] Figure 3 This is a side sectional view of an embodiment of the present invention.

[0028] Figure 4 This is an enlarged structural diagram of part A of an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the installation structure of a mobile component according to an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of a cable management rack structure according to an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of a mobile component according to an embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of the disassembled structure of the rubber pressing plate and the abutment plate according to an embodiment of the present invention.

[0033] In the diagram: 1. Main body of high and low voltage photovoltaic grid-connected cabinet; 2. Through hole; 3. Main circuit breaker; 4. Branch switch; 5. Guide rod; 6. Moving plate; 7. First spring; 8. Fixing frame; 9. Fixing rod; 10. Cable management frame; 11. Fixing plate; 12. Cable management trough; 13. T-shaped rod; 14. Protruding column; 15. First connecting frame; 16. Rubber pressing plate; 17. Groove; 18. Second connecting frame; 19. Connecting rod; 20. Abutment plate; 21. Abutment groove; 22. Second spring. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0037] Example 1: Please refer to Figure 1-8 As shown, this embodiment provides a protection device, including a high and low voltage photovoltaic grid-connected cabinet body 1, a main circuit breaker 3, multiple branch switches 4, a cable management frame 10, multiple cable passage holes 2, and moving components, etc.

[0038] In this embodiment, the main body 1 of the high- and low-voltage photovoltaic grid-connected cabinet serves as the load-bearing structure of the entire device. A main circuit breaker 3 and multiple branch switches 4 are fixedly installed inside. The main circuit breaker 3 and the multiple branch switches 4 are electrically connected via wires, and the other ends of each branch switch 4 are connected to external wiring. The main circuit breaker 3 and the branch switches 4 are used to control the on / off state of the circuit. When an overload, short circuit, or other abnormal situation occurs in the circuit, the main circuit breaker 3 or the corresponding branch switch 4 can promptly disconnect the circuit, protecting the safe and stable operation of the photovoltaic power generation system.

[0039] In this embodiment, the cable management frame 10 is located below multiple branch switches 4, and both ends of it are fixedly connected to the inner wall of the high and low voltage photovoltaic grid-connected cabinet body 1. The cable management frame 10 consists of three fixing plates 11, and multiple cable management grooves 12 are opened on one side of each fixing plate 11. The fixing plates 11 are fixedly connected to each other and are perpendicular to each other. After the wires enter the interior of the high and low voltage photovoltaic grid-connected cabinet body 1 through the through holes 2, they can pass through the cable management grooves 12 in sequence, thereby completing the arrangement and fixing of the wires, making the layout of the wires in the cabinet more neat and orderly, and facilitating subsequent maintenance and management.

[0040] In this embodiment, multiple through holes 2 are provided on one side of the back of the high and low voltage photovoltaic grid-connected cabinet body 1 to facilitate the entry and exit of wires. Wires enter the high and low voltage photovoltaic grid-connected cabinet body 1 from the outside through the through holes 2. After the connection is completed, excess wires can be led out of the cabinet through the through holes 2 to meet the needs of actual installation and use.

[0041] In this embodiment, the movable component includes a movable plate 6, a fixed rod 9, multiple fixed frames 8, a rubber pressing plate 16, and an abutment plate 20. The fixed rod 9 is fixedly installed between the inner walls of both sides of the main body 1 of the high and low voltage photovoltaic grid-connected cabinet, and is located above the multiple fixed frames 8. Each of the multiple fixed frames 8 consists of a T-shaped rod 13 and two protruding pillars 14, with the bottom end of the T-shaped rod 13 fixedly connected to the top of the movable plate 6. In actual use, after the wire enters through the through hole 2, it is first wound sequentially around the multiple fixed frames 8, then bent and wound around the fixed rod 9, and finally passes through the cable management frame 10 and connects to the branch switch 4. The multiple fixed frames 8 and the fixed rod 9 work together to complete the winding of the wire, forming a movable S-shaped redundant part. When the wire is subjected to external pulling, this redundant part can undergo a certain displacement, thereby buffering the pulling force and preventing the wire from being directly subjected to force, which would affect the wire connection end and effectively protect the safety of the wire and connection point.

[0042] In this embodiment, the movable component further includes two guide rods 5 fixedly installed inside the main body 1 of the high- and low-voltage photovoltaic grid-connected cabinet. Both guide rods 5 are located near the bottom inner wall of the main body 1. A movable plate 6 is slidably fitted onto the outer wall of the two guide rods 5, allowing it to slide freely on the guide rods 5. A first spring 7 is fitted onto the outer wall of each of the two guide rods 5. One end of each first spring 7 is fixedly connected to one side of the adjacent movable plate 6, and the other end of each first spring 7 is fixedly connected to one side inner wall of the main body 1 of the high- and low-voltage photovoltaic grid-connected cabinet. Under the elastic force of the first spring 7, the movable plate 6 can be pushed continuously away from the fixed rod 9, thereby ensuring that the multiple fixed frames 8 and fixed rods 9 can form a movable redundant portion for the wiring.

[0043] In this embodiment, the movable assembly further includes multiple first connecting brackets 15 fixedly installed on the side of the movable plate 6 away from the first spring 7, and a rubber pressing plate 16 fixedly installed on one side of multiple guide rods 5. Multiple grooves 17 are provided on one side of the rubber pressing plate 16, and the rubber pressing plate 16 cooperates with the cable management frame 10. After the cable is wound, its bent portion can be located between the rubber pressing plate 16 and the cable management frame 10. After the movable plate 6 moves, the pressing action of the rubber pressing plate 16 can complete the pressing and fixing of the bent portion of the cable, preventing the movement of redundant parts of the cable from affecting the connection end of the cable.

[0044] In this embodiment, the movable component further includes multiple second connecting frames 18 fixedly installed on one side of multiple first connecting frames 15. A connecting rod 19 slidably passes through one side of each of the multiple second connecting frames 18, and one end of each connecting rod 19 is fixedly connected to one side of an abutment plate 20. Multiple abutment grooves 21 are formed on the other side of the abutment plate 20. The abutment plate 20 slides into the top of the cable management frame 10, and the multiple abutment grooves 21 correspond to and cooperate with multiple cable management grooves 12. Second springs 22 are sleeved on the outer walls of each of the multiple connecting rods 19. One end of each second spring 22 is fixedly connected to one end of the corresponding connecting rod 19, and the other end of each second spring 22 is fixedly connected to one side of an adjacent second connecting frame 18. Under the elastic force of the second springs 22, the abutment plate 20 can be provided with a force to abut and compress the cable, enabling the abutment plate 20 to cooperate with the cable management frame 10 and complete the clamping and fixing of the corresponding cable. After the movable plate 6 moves, the abutment plate 20 can first approach the cable management rack 10, and can tighten the abutment groove 21 and the cable management groove 12 as the movable plate 6 moves. This allows the cable to be squeezed and locked before the rubber pressing plate 16, which can prevent the movement of the redundant part of the cable from affecting the connection end of the cable, and further improve the reliability of the cable connection.

[0045] This application can be used in the field of photovoltaic power generation technology, or in other fields applicable to this application.

[0046] Example 2: Reference Figure 5 , 7 An improvement based on Example 1: A photovoltaic power generation grid-connected protection device, which is applied to the field of photovoltaic power generation technology;

[0047] Furthermore, in this embodiment, both protruding posts 14 are fixedly connected to the outer wall of the corresponding T-shaped rod 13. The two protruding posts 14 are located near both ends of the T-shaped rod 13, and both protruding posts 14 are located on the side away from the through hole 2. This design ensures that the wire is not prone to slipping or falling off when wound around the outer wall of the T-shaped rod 13, making the wire more stable and reliable during the winding process.

[0048] In this embodiment, gaps are left between the T-shaped rod 13 and the inner wall of the adjacent high and low voltage photovoltaic grid-connected cabinet body 1, as well as between two adjacent T-shaped rods 13, to allow wires to pass through.

[0049] However, as is well known to those skilled in the art, the working principles and wiring methods of the main circuit breaker 3 and the branch switch 4 are commonplace and are all conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0050] The usage process and working principle of this utility model technical solution are as follows:

[0051] In use, the operator can insert the cables to be connected to the external photovoltaic power generation system into the cabinet through the through hole 2; the cables first wrap around the outer perimeter of the fixing rod 9, and then wrap around the outside of the T-shaped rod 13 of the corresponding fixing frame 8 in an S-shaped path; during this process, the protruding posts 14 at both ends of the crossbar of the T-shaped rod 13 can physically limit the cables and prevent the cables from sliding axially during the winding process; after the winding is completed, the cables can continue to be initially arranged along the cable management groove 12 of the cable management frame 10, and then each cable can be kept in a vertical arrangement and connected to the corresponding branch switch 4;

[0052] When the first spring 7 is in a free state, it will push the movable plate 6 to move away from the fixed rod 9 along the guide rod 5 to the maximum stroke position. At this time, the straight distance between the fixed frame 8 and the fixed rod 9 reaches the design maximum value, which can make the cable wire wrapped between the two form a preset length of S-shaped redundant bend. This redundant part can absorb the length change of the cable wire caused by thermal expansion and contraction. At the same time, when the external cable wire is pulled, as the movable plate 6 overcomes the preload of the first spring 7 and moves in the opposite direction along the guide rod 5, the fixed frame 8 can move closer to the fixed rod 9, and the redundant part can be extended to avoid damaging the connection of the cable wire inside the cabinet. After the external tension is eliminated, the first spring 7 will release elastic potential energy to push the movable plate 6 to reset. The movable plate 6 can drive the fixed frame 8 away from the fixed rod 9 again, which can make the redundant wire form an S-shaped bend again.

[0053] When the cable is subjected to external pulling, as the moving plate 6 moves, the abutment plate 20 will first approach the cable management rack 10. At this time, the abutment groove 21 and the cable management groove 12 will form a contraction clamp on the corresponding cable. As the moving plate 6 continues to move, the second spring 22 can gradually provide a pushing force for the abutment plate 20. At the same time, the movement of the moving plate 6 can also drive the rubber pressing plate 16 to approach the cable management rack 10. At this time, the rubber pressing plate 16 can press and fix the bent part of the cable on the cable management rack 10. The two fixing structures apply force in sequence to ensure that one end of the redundant part of the cable is fully fixed, and to ensure that the connection between the cable and the switch 4 will not be affected when the redundant part moves, thus ensuring the safety of the line connection.

[0054] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0055] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A photovoltaic power generation grid-connected protection device, comprising: The main body (1) of the high and low voltage photovoltaic grid-connected cabinet is equipped with a main circuit breaker (3) and multiple branch switches (4) fixedly installed inside. The main circuit breaker (3) and the branch switches (4) are electrically connected by wires, and the branch switches (4) are used to connect external wires; characterized in that it further includes: The cable management rack (10) is fixed to the inner wall of the main body (1) of the high and low voltage photovoltaic grid-connected cabinet and located below the branch switch (4). The cable management rack (10) is provided with multiple cable management grooves (12) to arrange the wires. Multiple through holes (2) are provided on the back of the main body (1) of the high and low voltage photovoltaic grid-connected cabinet for the introduction and exit of wires; The movable component includes a movable plate (6) that is slidably installed in the cabinet, a fixed rod (9) that is fixedly installed between the inner walls of the two sides of the main body (1) of the high and low voltage photovoltaic grid-connected cabinet, a plurality of fixed frames (8) that are vertically connected to the top of the movable plate (6), and an elastic mechanism and a graded fixing mechanism, wherein the fixed frames (8) and the fixed rod (9) constitute a wire winding structure. Multiple fixing brackets (8) and fixing rods (9) make the wires form an S-shaped redundant structure. When the wires are subjected to thermal expansion and contraction or external tension, the moving plate (6) overcomes the pre-tightening force of the elastic mechanism and moves to release the redundant length. The graded fixing mechanism keeps the wire connection point stable when the redundant section is displaced. The wire rack (10) cooperates with the wire passage hole (2) on the back of the cabinet to realize the neat arrangement of the wires.

2. A photovoltaic grid protection device as claimed in claim 1, characterized in that The cable management rack (10) consists of three fixed plates (11). Each of the fixed plates (11) has multiple cable management grooves (12) on one side. The fixed plates (11) are fixedly connected to each other and are arranged perpendicularly between adjacent fixed plates (11).

3. A photovoltaic grid protection device as claimed in claim 1, characterized in that, The elastic mechanism includes two guide rods (5) fixedly installed inside the main body (1) of the high and low voltage photovoltaic grid-connected cabinet and a first spring (7) sleeved on the outer wall of the guide rods (5). One end of each of the two first springs (7) is fixedly connected to one side of the adjacent moving plate (6), and the other end of each of the two first springs (7) is fixedly connected to one side of the inner wall of the main body (1) of the high and low voltage photovoltaic grid-connected cabinet. The multiple first springs (7) push the moving plate (6) to move axially along the guide rods (5).

4. The photovoltaic grid-tie protection device of claim 1, wherein, The graded fixing mechanism includes a rubber pressing plate (16) disposed on one side of the movable plate (6) and an abutment plate (20) connected by a second spring (22); a plurality of first connecting frames (15) are fixedly installed on one side of the rubber pressing plate (16), and the plurality of first connecting frames (15) are fixedly connected to one side of the movable plate (6); the rubber pressing plate (16) and the cable management rack (10) cooperate to form a cable bending part fixing structure; a plurality of second connecting frames (18) are disposed on one side of the abutment plate (20), and the plurality of second connecting frames (18) are fixedly connected to one side of the corresponding first connecting frame (15); the abutment plate (20) and the top of the cable management rack (10) slide to form a cable root clamping structure.

5. A photovoltaic grid protection device as claimed in claim 4, wherein, Multiple grooves (17) are provided on one side of the rubber pressing plate (16). The grooves (17) are corresponding to the cable management grooves (12) of the cable management frame (10) to form a flexible pressing structure for the bending part of the wire. The pressing structure keeps the deformation of the bending part controllable when the redundant section of the wire moves.

6. A photovoltaic grid protection device as claimed in claim 4, wherein, Multiple connecting rods (19) are fixedly installed on one side of the abutment plate (20). The multiple connecting rods (19) slide through the corresponding second connecting frame (18). The outer wall of the multiple connecting rods (19) is provided with a second spring (22). The two ends of the multiple second springs (22) are fixedly connected to one end of the corresponding connecting rod (19) and one side of the corresponding second connecting frame (18), respectively. When the moving plate (6) is moved by the tension, the abutment plate (20) contacts the cable rack (10) before the rubber pressing plate (16). Multiple abutment grooves (21) are opened on one side of the abutment plate (20), which cooperate with the cable rack (12) to form a rigid clamping point.

7. A photovoltaic grid protection device as claimed in claim 1, wherein, The T-shaped rod (13) of the fixing frame (8) is provided with protruding posts (14) at both ends. The protruding posts (14) are located on the side away from the through hole (2) to form an axial limiting structure for the wire.

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